Mitsubishi Diamante carpc

I'm new here and here's a pic of my project, it's almost complete. I'll post more of the pics from the project after I resize them.
My setup so far is: 10.4 touchscreen, MCS pc with 1.33, 1g of ram, 80g hd, built in bluetooth, slot loading external DVD/CDRW, gps, obdII, wifi, hdzoom radio, Pinnacle pro stick, 300 watt 4 channel Pyramid amp using factory Infinity speakers and a ground loop isolator, Optima deep cell battery, Trial version of Centrafuse, and I bought a bluetooth mini-mouse that I'm still waiting for.
I did the dash mod and instalation myself and still have some configuring to do but all seems good so far.....

Before pic with a Eonon 7" dvd,gps,tv,bluetooth,etc....cheap Hong Kong system. I loved it for the first week and then found this fourm and realised how much better a carpc could be.
The Eonon lasted 6 weeks and then I sold it on Ebay and started buying my pc parts. The new system mod and install took 2 weeks of my free time.

I have the exact same Pyramid 300watt AMP on my car, but I thinking of switching it out because it generates a small amount of noise for a split second when I power it up (even after windows has loaded and no music is playing). Have you noticed the same thing?

Blackstealth....I noticed a little noise when the key is on Acc and the door is open. I had alot of noise before I put in the ground loop isolator, I did have an almost dead battery at the time too and I read a bad battery will generate noise but I replaced the battery and added the isolator at the same time.

ContaiN....Mitsubishi made a VRX model of the Diamante that had the silver trim so I'm still kinda OEM! lol

I had a lot of alternator noise, fixed it with a ground loop isolator. My engine is off when I observed the "turn on" noise, I purchased a new battery last month so I don't they are responsible for the noise. Just curious if yours does the same thing as mine.